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Why Do You Need A Catch Can Rb26Dett

ripps

By ripps,
in Engines & Forced Induction

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ripps Collaborator

ripps

Posted
Posted

just in the last couple of stages of putting my engine back together. and wondering why i need a catch can? it is a rb26 running 2560 -5s, cp pistons, eagle rods, acl bearings 700 injectors and looking at runnning about between 22 and 24 psi. so any info or advice or a good answer to why i need a catch can and not run it all the standard way

gotRICE? Veteran

gotRICE?

Posted
Posted

just in the last couple of stages of putting my engine back together. and wondering why i need a catch can? it is a rb26 running 2560 -5s, cp pistons, eagle rods, acl bearings 700 injectors and looking at runnning about between 22 and 24 psi. so any info or advice or a good answer to why i need a catch can and not run it all the standard way

You dont HAVE to. All it does is seperate the oily mist from the air.

Stock setup it gets drawn out of the head into the intake pipes under boost, and inder Vac it is drawn out via the PCV too. It could possibly lower your octane rating slightly if you have alot of it. And it can also coat your turbine wheels and intercooler + pipes in an oily film over time.

Its up to you.

conan7772 Mentor

conan7772

Posted
Posted

If you have the N1 oil pump, chances are your head won't drain quick enough, even with the additional rear drain.

RB's are notorious for this, also one reason why so many Rb26's lose the main bearing.

I have RB25/30 with N1 pump, all oil feeds left unblocked, and no rear drain.

On my last track day , on hard left turns, my right side rocker cover filled up with oil, then the PCV spewed it all into my plenum and back out through my BOV all over the track.

Then again on acceleration out of the corner I had so much blue smoke, couldn't see the car behind me.

Oil dripped out the BOV for the next 6 weeks, and it probably sucked back into my intercooler too.

Block off your PCV at the least, and save your engine.

So when you do set up a can, as rice says, make it catch oily vapour too, keep that shit out of your intercooler.

Do the stainless steel wool gig, every bit helps.

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